When the Brocade device receives the VoIP phone query, it sends the voice VLAN ID in a reply
packet back to the VoIP phone. The VoIP phone then configures itself within the voice VLAN.
As long as the port to which the VoIP phone is connected has a voice VLAN ID, the phone will
configure itself into that voice VLAN. If you change the voice VLAN ID, the software will immediately
send the new ID to the VoIP phone, and the VoIP phone will re-configure itself with the new voice
VLAN.
VoIP configuration notes
• This feature works with any VoIP phone that:
‐ Runs CDP
‐ Sends a VoIP VLAN query message
‐ Can configure its voice VLAN after receiving the VoIP VLAN reply
• Automatic configuration of a VoIP phone will not work if one of the following applies:
‐ You do not configure a voice VLAN ID for a port with a VoIP phone
‐ You remove the configured voice VLAN ID from a port without configuring a new one
‐ You remove the port from the voice VLAN
• Make sure the port is able to intercept CDP packets (cdp run command).
• Some VoIP phones may require a reboot after configuring or re-configuring a voice VLAN ID. For
example, if your VoIP phone queries for VLAN information only once upon boot up, you must reboot
the VoIP phone before it can accept the VLAN configuration. If your phone is powered by a PoE
device, you can reboot the phone by disabling then re-enabling the port.
Enabling dynamic configuration of a Voice over IP (VoIP) phone
You can create a voice VLAN ID for a port, or for a group of ports.
To create a voice VLAN ID for a port, enter commands such as the following.
device(config)
# interface ethernet 2
device(config-if-e1000-2)# voice-vlan 1001
To create a voice VLAN ID for a group of ports, enter commands such as the following.
device(config)
# interface ethernet 1-8
device(config-mif-1-8)# voice-vlan 1001
Syntax: [no] voice-vlan voice-vlan-num
where voice-vlan-num is a valid VLAN ID between 1 - 4095.
To remove a voice VLAN ID, use the no form of the command.
Viewing voice VLAN configurations
You can view the configuration of a voice VLAN for a particular port or for all ports.
To view the voice VLAN configuration for a port, specify the port number with the show voice-vlan
command. The following example shows the command output results.
device# show voice-vlan ethernet 2
Voice vlan ID for port 2: 1001
VoIP configuration notes
76 FastIron Ethernet Switch Administration Guide
53-1003625-01
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